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CVE-2026-10631 is an access control vulnerability affecting the EWS extension in Zimbra Collaboration Suite. The issue was addressed in Zimbra Collaboration Suite 10.1.20. Publicly available information identifies the flaw only at a high level as an access control issue in the EWS component; no further technical details about the vulnerable code path, affected operations, or exploitation method are currently available.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An access control vulnerability in the Zimbra EWS extension.
An access control vulnerability in the Zimbra EWS extension.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.