CVE-2025-29457
Published: 17 April 2025
Summary
CVE-2025-29457 is a high-severity SSRF (CWE-918) vulnerability in Mybb Mybb. Its CVSS base score is 7.6 (High).
Operationally, ranked in the top 22.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2025-29457 is a server-side request forgery vulnerability (CWE-918) affecting the Import a Theme function in MyBB 1.8.38. The flaw permits a remote attacker to obtain sensitive information, reflected in a CVSS 3.1 score of 7.6 with network attack vector, low complexity, and low-privileged access requirements.
An authenticated board administrator or other low-privileged remote user can abuse the theme import feature to trigger SSRF requests, potentially disclosing internal resources or data that would otherwise be inaccessible.
MyBB documentation recommends limiting access to private hosts and IP addresses as a mitigation for this class of issue, while the vendor disputes the vulnerability on the grounds that the actions are permitted for administrators and that existing SSRF protections are in place.
EPSS remains low, with a current score of 0.0098 and a peak of only 0.0129.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-11804
Vulnerability details
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Import a Theme function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.
Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.
Validates server-side URLs and resource references to block SSRF attempts.
Detects server-side request forgery through monitoring of unexpected outbound connections.