CVE-2025-47784

Emlog is an open source website building system. Versions 2.5.13 and prior have a deserialization vulnerability. A user who creates a carefully crafted nickname can cause str_replace to replace the value of name_orig with empty, causing deserialization to fail and return false. Commit 9643250802188b791419e3c2188577073256a8a2 fixes the issue.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• https://github.com/emlog/emlog/commit/9643250802188b791419e3c2188577073256a8a2
• https://github.com/emlog/emlog/security/advisories/GHSA-f56g-m99v-mqc3