CVE-2021-39249 json
Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filenames of uploaded files become…
published 2021-08-17 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-25611
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filenames of uploaded files become predictable through a brute-force attack against the PHP mt_rand function.
Patch / fix
- invisioncommunity invision_power_board 4.6.5.1
Exploit prediction
0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- ssd-disclosure.com https://ssd-disclosure.com/ssd-advisory-ip-board-stored-xss-to-rce-chain/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-330 Use of Insufficiently Random Values
References
-
ssd-disclosure.com
/ssd-advisory-ip-board-stored-xss-to-rce-chain/
exploit, third-party-advisory
-
invisioncommunity.com
/release-notes/4651-r102/
release-notes, vendor-advisory
Sources
- CVE List CVE-2021-39249
- NVD CVE-2021-39249
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