CVE-2025-29458 Server-side request forgery in n/a

What is CVE-2025-29458?

CVE-2025-29458 is a high-severity server-side request forgery vulnerability in Mybb Mybb, published on 17 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-918

Which versions are affected by CVE-2025-29458?

It affects 1 product.

Products include Mybb Mybb.

How do I fix CVE-2025-29458?

No fix has been published for CVE-2025-29458 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2025-29458 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-29458 exists.

Other vulnerabilities in Mybb Mybb

• CVE-2011-10018 myBB 1.6.4 Backdoor Arbitrary Command Execution Critical 10.0
• CVE-2015-2786 Information disclosure in n/a Critical 10.0
• CVE-2011-5133 Cross-site scripting in n/a Critical 10.0
• CVE-2006-0218 SQL injection in n/a Critical 10.0
• CVE-2020-22612 Code injection in n/a Critical 9.8

All Mybb Mybb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3996-4m5r-mmwf.