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CVE-2023-50761: The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time.

MediumCVSS 4.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 17/100)

  • 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: 0.63% (FIRST EPSS); higher than 50.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: thunderbird (AlmaLinux:8) 115.6.0-1.el8_9.alma; thunderbird (AlmaLinux:9) 115.6.0-1.el9_3.alma; thunderbird (Debian:10) 1:115.6.0-1~deb10u1.

Low priority for now. Upgrade to thunderbird (AlmaLinux:8) 115.6.0-1.el8_9.alma; thunderbird (AlmaLinux:9) 115.6.0-1.el9_3.alma; thunderbird (Debian:10) 1:115.6.0-1~deb10u1 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

The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time. If present, Thunderbird did not compare the signature creation date with the message date and time, and displayed a valid signature despite a date or time mismatch. This could be used to give recipients the impression that a message was sent at a different date or time. This vulnerability affects Thunderbird < 115.6.

Published
Dec 19, 2023
Updated
Jun 17, 2026
EPSS
0.6% · 50th percentile
CWE
—

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

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  • Not in KEV: no record of exploitation in the wild
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  • 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.

VendorProduct
mozillathunderbird
debiandebian linux

Versions reported by the vendor

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

  • Mozilla Thunderbird

    • unspecified and later · before 115.6affected

Affected versions

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

  • debian debian linux11.0
  • debian debian linux12.0
  • mozilla thunderbirdbefore 115.6

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8thunderbirdbefore 115.6.0-1.el8_9.alma115.6.0-1.el8_9.alma
AlmaLinux:9thunderbirdbefore 115.6.0-1.el9_3.alma115.6.0-1.el9_3.alma
Debian:10thunderbirdbefore 1:115.6.0-1~deb10u11:115.6.0-1~deb10u1
Debian:11thunderbirdbefore 1:115.6.0-1~deb11u11:115.6.0-1~deb11u1
Debian:12thunderbirdbefore 1:115.6.0-1~deb12u11:115.6.0-1~deb12u1
Debian:13thunderbirdbefore 1:115.6.0-11:115.6.0-1
openSUSE:Leap 15.5MozillaThunderbirdbefore 115.6.0-150200.8.142.2115.6.0-150200.8.142.2
openSUSE:TumbleweedMozillaThunderbirdbefore 115.6.0-1.1115.6.0-1.1
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:115.6.0-1.el7_90:115.6.0-1.el7_9
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:115.6.0-1.el7_90:115.6.0-1.el7_9
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:115.6.0-1.el8_90:115.6.0-1.el8_9
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:115.6.0-1.el8_90:115.6.0-1.el8_9
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:115.6.0-1.el8_90:115.6.0-1.el8_9
Red Hat:enterprise_linux:9::appstreamthunderbirdbefore 0:115.6.0-1.el9_30:115.6.0-1.el9_3
Red Hat:enterprise_linux:9::appstreamthunderbird-debuginfobefore 0:115.6.0-1.el9_30:115.6.0-1.el9_3
Red Hat:enterprise_linux:9::appstreamthunderbird-debugsourcebefore 0:115.6.0-1.el9_30:115.6.0-1.el9_3
Red Hat:rhel_aus:8.2::appstreamthunderbirdbefore 0:115.6.0-1.el8_20:115.6.0-1.el8_2
Red Hat:rhel_aus:8.2::appstreamthunderbird-debuginfobefore 0:115.6.0-1.el8_20:115.6.0-1.el8_2
Red Hat:rhel_aus:8.2::appstreamthunderbird-debugsourcebefore 0:115.6.0-1.el8_20:115.6.0-1.el8_2
Red Hat:rhel_aus:8.4::appstreamthunderbirdbefore 0:115.6.0-1.el8_40:115.6.0-1.el8_4
Red Hat:rhel_aus:8.4::appstreamthunderbird-debuginfobefore 0:115.6.0-1.el8_40:115.6.0-1.el8_4
Red Hat:rhel_aus:8.4::appstreamthunderbird-debugsourcebefore 0:115.6.0-1.el8_40:115.6.0-1.el8_4
Red Hat:rhel_eus:8.6::appstreamthunderbirdbefore 0:115.6.0-1.el8_60:115.6.0-1.el8_6
Red Hat:rhel_eus:8.6::appstreamthunderbird-debuginfobefore 0:115.6.0-1.el8_60:115.6.0-1.el8_6

+12

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-11705A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email…
    42Plan
  • CVE-2019-11704A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email…
    42Plan
  • CVE-2019-11703A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-0616Jun 2, 2023 · If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to process and display the message…
    26Monitor
  • ← EarlierCVE-2023-3417Jul 24, 2023 · File Extension Spoofing using the Text Direction Override Character
    30Monitor
  • Later →CVE-2023-50762Dec 19, 2023 · When processing a PGP/MIME payload that contains digitally signed text, the first paragraph of the text was never shown to the user.
    17Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
almalinux:thunderbird115.6.0-1.el9_3.alma · AlmaLinux:9Package registry (OSV)
debian:thunderbird1:115.6.0-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:MozillaThunderbird115.6.0-150200.8.142.2 · openSUSE:Leap 15.5Package registry (OSV)
red hat:thunderbird0:115.6.0-1.el9_3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:115.6.0-1.el9_3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:115.6.0-1.el9_3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:thunderbird0:115.6.0-1.el8_9 · Rocky Linux:8Package registry (OSV)
suse:MozillaThunderbird115.6.0-150200.8.142.2 · SUSE:Linux Enterprise Module for Package Hub 15 SP5Package 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.

Credits

All researchers

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

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (3 more)

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

All records