HOMEVULNERABILITIESCVE-2021-26076
LOW

CVE-2021-26076

NVD-CWE-noinfoPublished: April 15, 2021· Updated: Jun 17, 2026

3.7
CVSS v3.1

Official Description

The jira.editor.user.mode cookie set by the Jira Editor Plugin in Jira Server and Data Center before version 8.5.12, from version 8.6.0 before version 8.13.4, and from version 8.14.0 before version 8.15.0 allows remote anonymous attackers who can perform an attacker in the middle attack to learn which mode a user is editing in due to the cookie not being set with a secure attribute if Jira was configured to use https.

NVD Source

Technical Analysis

CVE-2021-26076 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

Atlassian4 product(s)
data centerjirajira data centerjira server
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://jira.atlassian.com/browse/JRASERVER-72252
PATCHhttps://jira.atlassian.com/browse/JRASERVER-72252

All References (2)

→
https://jira.atlassian.com/browse/JRASERVER-72252Patch · Vendor Advisory
→
https://jira.atlassian.com/browse/JRASERVER-72252Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2021-26076
CVSS Score3.7 / 10
SeverityLOW
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedApr 15, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2014-2623
10.0
CVE-2011-0807
10.0
CVE-2023-45894
10.0
CVE-2024-22216
10.0
CVE-2017-6326
10.0
CVE-2015-3042
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-26076 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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