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CVE-2021-46900

19
FAUCET Score

CVE-2021-46900 is a high-severity vulnerability affecting Sympa before version 6.2.62, where the software improperly uses a cookie parameter for security objectives, specifically as a password salt and XSS protection mechanism, without ensuring its existence or unpredictability. This flaw allows for a network-based attack with low complexity and no user interaction, potentially leading to high confidentiality impact. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.2.62CPE matchmatch criteria
cpe:2.3:a:sympa:sympa:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 10th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryworkaround availablevia nvd_reference
View patch

References

github.com / sympa-community/sympa-community.github.io/blob/master/security/2021-001.md
MitigationVendor Advisory
github.com / sympa-community/sympa/issues/1091
Issue TrackingMitigationVendor Advisory
sympa.community / security/2021-001.html
MitigationVendor Advisory