Plaintext of decrypted emails can leak through by user submitting an embedded form by pressing enter key within a text input field.
Plaintext of decrypted emails can leak through by user submitting an embedded form by pressing enter key within a text input field. This vulnerability affects Thunderbird < 52.9.
- Published
- Oct 18, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.0% · 80th percentile
- CWE
- CWE-200
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.0%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mozilla | thunderbird | cpe:2.3:a:mozilla:thunderbird |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- canonical ubuntu linux18.04
- debian debian linux8.0
- debian debian linux9.0
- mozilla thunderbirdbefore 52.9.0
- redhat enterprise linux6.0
- redhat enterprise linux7.0
- redhat enterprise linux7.5
- redhat enterprise linux7.6
- redhat enterprise linux desktop6.0
- redhat enterprise linux desktop7.0
- redhat enterprise linux server6.0
- redhat enterprise linux server7.0
- redhat enterprise linux workstation6.0
- redhat enterprise linux workstation7.0
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 52.9affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | thunderbird | before 1:52.9.0-1 | 1:52.9.0-1 |
| Debian:8 | thunderbird | before 1:52.9.1-1~deb8u1 | 1:52.9.1-1~deb8u1 |
| Debian:9 | thunderbird | before 1:52.9.1-1~deb9u1 | 1:52.9.1-1~deb9u1 |
| Red Hat:enterprise_linux:6::client | thunderbird | before 0:52.9.1-1.el6 | 0:52.9.1-1.el6 |
| Red Hat:enterprise_linux:6::client | thunderbird-debuginfo | before 0:52.9.1-1.el6 | 0:52.9.1-1.el6 |
| Red Hat:enterprise_linux:7::client | thunderbird | before 0:52.9.1-1.el7_5 | 0:52.9.1-1.el7_5 |
| Red Hat:enterprise_linux:7::client | thunderbird-debuginfo | before 0:52.9.1-1.el7_5 | 0:52.9.1-1.el7_5 |
| SUSE:Linux Enterprise Workstation Extension 15 | MozillaThunderbird | before 52.9.1-3.7.1 | 52.9.1-3.7.1 |
Same product
mozilla: all recordsOther 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 mess42Plan
- 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 messages,42Plan
- CVE-2015-2740Buffer overflow in the nsXMLHttpRequest::AppendToResponseText function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x42Plan
- CVE-2013-5603Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in Mozilla Firefox before 25.0, Firefox ESR 42Plan
- CVE-2013-1719Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 24.0, Thunderbird before 24.0, and SeaMonkey before 2.242Plan
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 |
|---|---|---|
| debian:thunderbird | 1:52.9.0-1 · Debian:12 | Package registry (OSV) |
| red hat:thunderbird | 0:52.9.1-1.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:thunderbird-debuginfo | 0:52.9.1-1.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| suse:MozillaThunderbird | 52.9.1-3.7.1 · SUSE:Linux Enterprise Workstation Extension 15 | 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.
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.
No commit or PR link among the references.
Credits
All researchersFinders, 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.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-200 · Exposure of Sensitive Information to an Unauthorized ActorCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
nvd-primary
Root cause
The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.
The bug in code
The whole CWE-200 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
{ "permissions": ["tabs", "<all_urls>"], "background": { "service_worker": "analytics.js" }}Fixed
{ "permissions": ["activeTab"], "host_permissions": ["https://yildiz.example/*"]}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)
- ExcavationCAPEC-116likelihood: High · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- FootprintingCAPEC-169likelihood: High · Very Low
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- FingerprintingCAPEC-224likelihood: High · Very Low
- ICMP Echo Request PingCAPEC-285likelihood: Medium · Low
- TCP SYN ScanCAPEC-287Low
- Enumerate Mail Exchange (MX) RecordsCAPEC-290Low
ATT&CK techniques
- System Service DiscoveryT1007
- System Network Configuration DiscoveryT1016
- Remote System DiscoveryT1018
- System Owner/User DiscoveryT1033
- Masquerading: Match Legitimate Name or LocationT1036.005
- Network Service ScanningT1046
- System Network Connections DiscoveryT1049
- Process DiscoveryT1057
- Permission Groups DiscoveryT1069
- System Information DiscoveryT1082
- File and Directory DiscoveryT1083
- Account DiscoveryT1087
- Multi-Factor Authentication InterceptionT1111
- Peripheral Device DiscoveryT1120
- System Time DiscoveryT1124
- Access Token Manipulation:Token Impersonation/TheftT1134.001
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- www.securityfocus.com/bid/104613
- access.redhat.com/errata/RHSA-2018:2251
- access.redhat.com/errata/RHSA-2018:2252
- bugzilla.mozilla.org/show_bug.cgi?id=1462910
- lists.debian.org/debian-lts-announce/2018/07/msg00013.html
- security.gentoo.org/glsa/201811-13
- usn.ubuntu.com/3714-1/
- www.debian.org/security/2018/dsa-4244
- www.mozilla.org/security/advisories/mfsa2018-18/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.