- 4.3MediumCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Timeline
ID reserved
By mozilla
Published
- 11 months later
· 11 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Affected products
- unaffected 115.24 – ≤ 115.*
- unaffected 128.11 – ≤ 128.*
- unaffected 139 – ≤ *
- unaffected 128.11 – ≤ 128.*
- unaffected 139 – ≤ *
References
References8
- https://bugzilla.mozilla.org/show_bug.cgi?id=1960745 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-42/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-43/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-44/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-45/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-46/ (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-18108 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-5263)Record last updated .