CVE-2025-68113 describes a cryptographic semantic binding flaw in ALTCHA libraries, a privacy-first captcha and bot protection software. This vulnerability allows challenge payload splicing, potentially enabling replay attacks by reinterpreting valid proof-of-work submissions with modified expiration values. The CVSS score of 6.5 (Medium) indicates a network-based attack with low complexity, impacting the integrity and availability of abuse-prevention mechanisms, but not directly affecting data confidentiality. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability. Users are advised to upgrade to patched versions of affected ALTCHA packages or implement the recommended mitigation of appending a delimiter to the salt value.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Altcha-Org | Altcha-Lib | < 1.4.1CNA affected |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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