Critical severity · published Oct 19, 2026
CVE-2026-90910
Apache Answer: Reaction API authorization bypass for restricted content
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
Missing authentication for critical function vulnerability in Apache Answer.
This issue affects Apache Answer: through 2.0.2.
The reaction API did not enforce content visibility controls, allowing unauthorized users to read reaction metadata from restricted content or add and remove their own reactions.
Users are recommended to upgrade to version 2.0.3, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AA
Apache Answer · Apache Software Foundation
through 2.0.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90910
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90910
lists.apache.org
https://lists.apache.org/thread/bhw80mvmnt9206wyqz80rcbwx1znv1p3
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/10/16/34
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