Public mode

No access to your tenant or devices. Every item links to its source. What this means

Some sources, documents or advisories need attention: 264/275 feeds/APIs · 469/469 docs · 8/9 advisories · checked 11:03 UTC Customize Public modeDiscuss ChangeIntel on Discord

ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

12 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

11 Nov 2026 04:35:04 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

9 Nov 2026 04:10:36 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

7 Nov 2026 03:31:39 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

5 Nov 2026 02:59:40 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

3 Nov 2026 02:11:03 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

1 Nov 2026 01:16:14 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

30 Oct 2026 01:01:10 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

27 Oct 2026 23:55:34 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

euvd · EUVD-2025-203484 · Published

25 Oct 2026 04:17:10 UTC

ALTCHA is privacy-first software for captcha and bot protection. A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind ch…

nvd · CVE-2025-68113 · Published

24 Oct 2026 13:19:41 UTC

ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay in github.com/altcha-org/altcha-lib-go

osv · GO-2025-4239 · Published

24 Oct 2026 13:17:17 UTC

ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

osv · GHSA-6gvq-jcmp-8959 · Published

23 Oct 2026 15:48:27 UTC

ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

cve-program · CVE-2025-68113 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 11:03 UTC · 264 of 275 readable · 263 fully read · documentation 469/469 current