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Vulnerability record · CVE-2021-37746 · published 30 July 2021

CVE-2021-37746: Claws-mail open redirect vulnerability

Claws Mail · Claws Mail

textview_uri_security_check in textview.c in Claws Mail before 3.18.0, and Sylpheed through 3.7.0, does not have sufficient link checks before accepting a click.

6.1 CVSS 3.1 Medium EPSS 1.2% · top 33.3% CWE-601 · Open redirect
6.1CVSS 3.1 base score, v2 5.8
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

textview_uri_security_check in textview.c in Claws Mail before 3.18.0, and Sylpheed through 3.7.0, does not have sufficient link checks before accepting a click.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://claws-mail.org/download.php?file=releases/claws-mail-3.18.0.tar.xz PatchVendor Advisory
https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=ac286a71ed78429e16c612161251b9ea90ccd431
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L2QNUIWASJLPUZZKWICGCEG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RCJXHUSYHGVBSH2ULD7HNXL
https://sylpheed.sraoss.jp/sylpheed/v3.7/sylpheed-3.7.0.tar.xz PatchThird Party Advisory
https://claws-mail.org/download.php?file=releases/claws-mail-3.18.0.tar.xz PatchVendor Advisory
https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=ac286a71ed78429e16c612161251b9ea90ccd431
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L2QNUIWASJLPUZZKWICGCEG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RCJXHUSYHGVBSH2ULD7HNXL
https://sylpheed.sraoss.jp/sylpheed/v3.7/sylpheed-3.7.0.tar.xz PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-37746), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.