Zulip Server before 2.1.5 allows reflected XSS via the Dropbox webhook.

published 2020-08-21 6y ago modified 2026-06-17 4mo ago also EUVD-2020-5045

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

Patch / fix

fixed in 1

zulip zulip_server 2.1.5

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Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

blog.zulip.com /2020/06/17/zulip-server-2-1-5-security-release/
release-notes, vendor-advisory

Sources

CVE List CVE-2020-12759
NVD CVE-2020-12759

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.