CVE-2025-29457: mybb SSRF — Exploit

Description

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.

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CVSS v3.1 Score

7.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
mybb	mybb	All

References

Exploits

https://www.yuque.com/morysummer/vx41bz/vro4dvxzuiwlg6uv

Other References

https://docs.mybb.com/1.8/administration/security/protection/#limit-access-to-private-hosts-and-ip-addresses

Frequently Asked Questions

What is CVE-2025-29457? +

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. It has a CVSS v3.1 base score of 7.6 (HIGH).

How severe is CVE-2025-29457? +

CVE-2025-29457 has a CVSS v3.1 score of 7.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-29457? +

CVE-2025-29457 affects products from mybb, specifically: mybb. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-29457? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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