CVE-2026-28281 json
InstantCMS has Multiple CSRF Vulnerabilities
published 2026-03-09 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-10405
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
InstantCMS is a free and open source content management system. Prior to 2.18.1, InstantCMS does not validate CSRF tokens, which allows attackers grant moderator privileges to users, execute scheduled tasks, move posts to trash, and accept friend requests on behalf of the user. This vulnerability is fixed in 2.18.1.
Patch / fix
- instantcms instantcms 2.18.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N |
Affected products
- instantsoft icms2
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
References
-
github.com
/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m
exploit, mitigation, vendor-advisory
Sources
- CVE List CVE-2026-28281
- NVD CVE-2026-28281
Fencer Vulns 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.