CVE-2022-39249· NVD / CVE Program· CNA GitHub_M

Matrix Javascript SDK vulnerable to impersonation via forwarded Megolm sessions

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: thunderbird (AlmaLinux:8) 102.4.0-1.el8_6.alma; thunderbird (AlmaLinux:9) 102.4.0-1.el9_0.alma; matrix-js-sdk (npm) 19.7.0.

Low priority for now. Upgrade to thunderbird (AlmaLinux:8) 102.4.0-1.el8_6.alma; thunderbird (AlmaLinux:9) 102.4.0-1.el9_0.alma; matrix-js-sdk (npm) 19.7.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-js-sdk implementing a too permissive key forwarding strategy on the receiving end. Starting with version 19.7.0, the default policy for accepting key forwards has been made more strict in the matrix-js-sdk. matrix-js-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately, for example, by showing a warning for such messages. This attack requires coordination between a malicious homeserver and an attacker, and those who trust your homeservers do not need a workaround.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Sep 28, 2022
Updated: Jun 17, 2026
EPSS: 1.2% · 69th percentile
CWE: CWE-287

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.2%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.5
CNA · GitHub_M: 7.5; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
matrix	javascript sdk	cpe:2.3:a:matrix:javascript_sdk

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

matrix javascript sdkbefore 19.7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

matrix-org matrix-js-sdk
- < 19.7.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	thunderbird	before 102.4.0-1.el8_6.alma	102.4.0-1.el8_6.alma
AlmaLinux:9	thunderbird	before 102.4.0-1.el9_0.alma	102.4.0-1.el9_0.alma
Debian:11	node-matrix-js-sdk	from 0	—
npm	matrix-js-sdk	before 19.7.0	19.7.0
openSUSE:Leap 15.3	MozillaThunderbird	before 102.4.0-150200.8.85.1	102.4.0-150200.8.85.1
openSUSE:Tumbleweed	element-desktop	before 1.11.8-1.1	1.11.8-1.1
openSUSE:Tumbleweed	element-web	before 1.11.8-1.1	1.11.8-1.1
openSUSE:Tumbleweed	MozillaThunderbird	before 102.3.1-1.1	102.3.1-1.1
Red Hat:enterprise_linux:7::client	thunderbird	before 0:102.4.0-1.el7_9	0:102.4.0-1.el7_9
Red Hat:enterprise_linux:7::client	thunderbird-debuginfo	before 0:102.4.0-1.el7_9	0:102.4.0-1.el7_9
Red Hat:enterprise_linux:8::appstream	thunderbird	before 0:102.4.0-1.el8_6	0:102.4.0-1.el8_6
Red Hat:enterprise_linux:8::appstream	thunderbird-debuginfo	before 0:102.4.0-1.el8_6	0:102.4.0-1.el8_6
Red Hat:enterprise_linux:8::appstream	thunderbird-debugsource	before 0:102.4.0-1.el8_6	0:102.4.0-1.el8_6
Red Hat:enterprise_linux:9::appstream	thunderbird	before 0:102.4.0-1.el9_0	0:102.4.0-1.el9_0
Red Hat:enterprise_linux:9::appstream	thunderbird-debuginfo	before 0:102.4.0-1.el9_0	0:102.4.0-1.el9_0
Red Hat:enterprise_linux:9::appstream	thunderbird-debugsource	before 0:102.4.0-1.el9_0	0:102.4.0-1.el9_0
Red Hat:rhel_e4s:8.1::appstream	thunderbird	before 0:102.4.0-1.el8_1	0:102.4.0-1.el8_1
Red Hat:rhel_e4s:8.1::appstream	thunderbird-debuginfo	before 0:102.4.0-1.el8_1	0:102.4.0-1.el8_1
Red Hat:rhel_e4s:8.1::appstream	thunderbird-debugsource	before 0:102.4.0-1.el8_1	0:102.4.0-1.el8_1
Red Hat:rhel_eus:8.2::appstream	thunderbird	before 0:102.4.0-1.el8_2	0:102.4.0-1.el8_2
Red Hat:rhel_eus:8.2::appstream	thunderbird-debuginfo	before 0:102.4.0-1.el8_2	0:102.4.0-1.el8_2
Red Hat:rhel_eus:8.2::appstream	thunderbird-debugsource	before 0:102.4.0-1.el8_2	0:102.4.0-1.el8_2
Red Hat:rhel_eus:8.4::appstream	thunderbird	before 0:102.4.0-1.el8_4	0:102.4.0-1.el8_4
Red Hat:rhel_eus:8.4::appstream	thunderbird-debuginfo	before 0:102.4.0-1.el8_4	0:102.4.0-1.el8_4

Same product

matrix: all records

Other highest-scoring records for the same primary product.

CVE-2023-28427Prototype pollution in matrix-js-sdk
32Monitor
CVE-2022-39250Matrix JavaScript SDK vulnerable to key/device identifier confusion in SAS verification
30Monitor
CVE-2022-39251Matrix Javascript SDK vulnerable to Olm/Megolm protocol confusion
30Monitor

Published before and after this one in the same product

← EarlierCVE-2021-40823Sep 13, 2021 · A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix hom
23Monitor
← EarlierCVE-2022-39236Sep 28, 2022 · Matrix Javascript SDK improper beacon events can cause availability issues
21Monitor
Later →CVE-2022-36059Mar 28, 2023 · Prototype pollution in matrix-js-sdk
21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
almalinux:thunderbird	102.4.0-1.el9_0.alma · AlmaLinux:9	Package registry (OSV)
npm:matrix-js-sdk	19.7.0	Package registry (OSV)
opensuse:element-desktop	1.11.8-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:element-web	1.11.8-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:MozillaThunderbird	102.4.0-150200.8.85.1 · openSUSE:Leap 15.3	Package registry (OSV)
red hat:thunderbird	0:102.4.0-1.el9_0 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:thunderbird-debuginfo	0:102.4.0-1.el9_0 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:thunderbird-debugsource	0:102.4.0-1.el9_0 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
rocky linux:thunderbird	0:102.4.0-1.el8_6 · Rocky Linux:8	Package registry (OSV)
suse:MozillaThunderbird	102.4.0-150200.8.85.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP3	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records