CVE-2026-93647

LOWCVSS 9.3 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.

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0.0/ 10 priority

Sources & remediation

Other references

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Referenced assets1 URL

By indicator

https://undercodetesting.com/critical-cve-2026-93647-mitigating-stored-cross-site-scripting-vulnerabilities-in-zimbra-collaboration-suite-video/

Full discourse1 post

UNDERCODE TESTING@UndercodeUpdate1d
🚨 Critical #CVE-2026-93647: Mitigating Stored Cross-Site Scripting Vulnerabilities in Zimbra Collaboration Suite + Video -Prediction: 📈 1 Positive | 📉 1 Negative https://undercodetesting.com/critical-cve-2026-93647-mitigating-stored-cross-site-scripting-vulnerabilities-in-zimbra-collaboration-suite-video/ Educational Purposes!
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