🛡️ CVE-2026-8670 — avantra

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Changed — a successful attack reaches components beyond the vulnerable one.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-8670 is classified as CWE-613: Insufficient Session Expiration. Sessions stay valid longer than they should, so an old identifier still grants access.

Affected software

CVE-2026-8670 is recorded against 1 package.

• avantra (fixed in 25.3.1)

Timeline and source

Published on 22 May 2026 and last revised on 23 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

support.avantra.com

Other advisories for this package

avantra has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-8673 (5.9 Medium, published 22 May 2026)
• CVE-2026-8672 (5.1 Medium, published 22 May 2026)
• CVE-2026-8671 (7.5 High, published 22 May 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-613: Insufficient Session Expiration) in other software:

• CVE-2026-17600 (published 7 Aug 2026)
• CVE-2025-12627 (2.4 Low, published 6 Aug 2026)
• CVE-2026-48079 (7.4 High, published 6 Aug 2026)
• CVE-2025-12317 (5.0 Medium, published 6 Aug 2026)
• CVE-2024-8995 (4.9 Medium, published 6 Aug 2026)
• CVE-2026-71206 (8.3 High, published 5 Aug 2026)
• CVE-2026-39924 (6.8 Medium, published 5 Aug 2026)
• CVE-2026-60053 (9.1 Critical, published 5 Aug 2026)

Details

Affected Packages

References