CVE-2022-1520: mozilla thunderbird Origin Validation Error
Vulnerability summary
CVE-2022-1520 is a medium (CVSS 4.3) Origin Validation Error vulnerability in mozilla thunderbird. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 12 · Related 3Timeline
- 22-12-2022PublishedVulnerability first disclosed.
- 16-04-2025Last modifiedVulnerability information updated.
Description
When viewing an email message A, which contains an attached message B, where B is encrypted or digitally signed or both, Thunderbird may show an incorrect encryption or signature status. After opening and viewing the attached message B, when returning to the display of message A, the message A might be shown with the security status of message B. This vulnerability affects Thunderbird < 91.9.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
0.00 pp
From 0.27% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- thunderbird< 1:91.9.0-1
Mozilla1 product
- thunderbird≥ unspecified, < 91.9 | < 91.9
Ubuntu1 product
- thunderbird< 1:91.9.1+build1-0ubuntu0.18.04.1 | < 1:91.9.1+build1-0ubuntu0.20.04.1 | < 1:91.9.1+build1-0ubuntu0.22.04.1
3 vendors · 3 products
References
7 links- www.mozilla.org/security/advisories/mfsa2022-18/Vendor Advisory
