CVE-2026-53962 json
Discourse: Insufficient SVG sanitization logic
published 4mo ago modified 2mo ago also BIT-discourse-2026-53962 , EUVD-2026-42734 , GHSA-jmcf-3367-78vv
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, insufficient SVG sanitization in upload and user avatar handling could lead to cross-site scripting when a user visited specific URLs that are not normally part of community browsing. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Patch / fix
- bitnami discourse 2026.1.5, 2026.4.2, 2026.5.1
- discourse discourse 2026.1.5, 2026.4.2, 2026.5.1
- github.com/discourse/discourse@3ee8343 commit
- github.com/discourse/discourse@810c271 commit
- github.com/discourse/discourse@92a699d commit
- github.com/discourse/discourse@b8ceb49 commit
- github.com/discourse/discourse/releases/tag/v2026.1.5 release
- github.com/discourse/discourse/releases/tag/v2026.4.2 release
- github.com/discourse/discourse/releases/tag/v2026.5.1 release
- github.com/discourse/discourse/releases/tag/v2026.6.0 release
Is CVE-2026-53962 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | >=2026.1.0, <2026.1.5 >=2026.4.0, <2026.4.2 >=2026.5.0, <2026.5.1 |
2026.1.5 2026.4.2 2026.5.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358
patch
-
github.com
/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff
patch
-
github.com
/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dad
patch
-
github.com
/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe
patch
-
github.com
/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vv
vendor-advisory, advisory
-
github.com
/discourse/discourse/releases/tag/v2026.1.5
release-notes, article
-
github.com
/discourse/discourse/releases/tag/v2026.4.2
release-notes, article
-
github.com
/discourse/discourse/releases/tag/v2026.5.1
release-notes, article
-
github.com
/discourse/discourse/releases/tag/v2026.6.0
release-notes, article
-
nvd.nist.gov
/vuln/detail/CVE-2026-53962
web
Sources
- CVE List CVE-2026-53962
- NVD CVE-2026-53962
- OSV BIT-discourse-2026-53962
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.