4.3

CVE-2021-26076: atlassian data_center

Modified
Published 14-04-2021Last modified 17-10-2024

Vulnerability summary

CVE-2021-26076 is a medium (CVSS 4.3) vulnerability in atlassian data_center. EPSS estimates a 1.32% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v2.0 (NVD)
EPSS score
1.32%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2021
    PublishedVulnerability first disclosed.
  2. 17-10-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.32%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

Increase +0.09 pp

From 1.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Atlassian4 products
  • data_center< 8.5.12
  • jira< 8.5.12
  • jira_data_center≥ unspecified, < 8.5.12 | ≥ 8.6.0, < unspecified | ≥ unspecified, < 8.13.4 | ≥ 8.14.0, < unspecified | ≥ unspecified, < 8.15.0 | ≥ 8.6.0, < 8.13.4 | ≥ 8.14.0, < 8.15.1
  • jira_server≥ unspecified, < 8.5.12 | ≥ 8.6.0, < unspecified | ≥ unspecified, < 8.13.4 | ≥ 8.14.0, < unspecified | ≥ unspecified, < 8.15.0 | ≥ 8.6.0, < 8.13.4 | ≥ 8.14.0, < 8.15.1

1 vendor · 4 products

References

1 links