SSRF in Mybb
CVE-2025-29458
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Change Avatar function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (35.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Mybb — versions 1.8.38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.yuque.com/morysummer/vx41bz/qu7zyyxr84qno64e (Exploit, Third Party Advisory)
- docs.mybb.com/1.8/administration/security/protection/ (Product, Mitigation)
Frequently asked questions
- What is CVE-2025-29458?
- CVE-2025-29458 is a high-severity vulnerability in Mybb, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.6/10. Published 2025-04-17.
- How severe is CVE-2025-29458?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2025-29458 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.