CVE-2021-26076
CVE-2021-26076 is a low-severity vulnerability in Atlassian Data Center with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Low (CVSS 3.x base score 3.7)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (65th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Atlassian Data Center
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-26076?
- 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.
- How severe is CVE-2021-26076?
- CVE-2021-26076 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2021-26076 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-26076?
- CVE-2021-26076 primarily affects Atlassian Data Center. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-26076?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-26076 published?
- CVE-2021-26076 was published on 2021-04-15 and last updated on 2026-06-17.
References
Affected products (4)
- cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:*
- cpe:2.3:a:atlassian:jira:*:*:*:*:*:*:*:*
- cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
- cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
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