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CVE-2022-21706

31
FAUCET Score

CVE-2022-21706 is a critical access control vulnerability affecting Zulip Server versions 2.0.0 and above. It allows multi-use invitations created in one organization to grant unauthorized access to any other organization hosted on the same server, bypassing email domain restrictions and potentially granting elevated privileges. With a CVSS score of 9.8 (CRITICAL), this vulnerability has a network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. There is no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 4.10.0CPE matchmatch criteria
cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0121 is in the 51st percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

blog.zulip.com / 2022/02/25/zulip-cloud-invitation-vulnerability
Vendor Advisory
blog.zulip.com / 2022/02/25/zulip-server-4-10-security-release
Vendor Advisory
github.com / zulip/zulip/commit/88917019f03860609114082cdc0f31a561503f9e
PatchThird Party Advisory
github.com / zulip/zulip/security/advisories/GHSA-6xmj-2wcm-p2jc
Third Party Advisory