How severe is CVE-2021-26068?

CVE-2021-26068 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26068 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26068?

CVE-2021-26068 affects Atlassian Jira Server For Slack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26068?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26068 published?

CVE-2021-26068 was published on 2021-02-22 and last updated on 2026-06-17.

CVE-2021-26068

CVE-2021-26068 is a high-severity vulnerability in Atlassian Jira Server For Slack with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Atlassian Jira Server For Slack
Published: 2021-02-22
Last modified: 2026-06-17

Description

An endpoint in Atlassian Jira Server for Slack plugin from version 0.0.3 before version 2.0.15 allows remote attackers to execute arbitrary code via a template injection vulnerability.

Frequently asked questions

What is CVE-2021-26068?: An endpoint in Atlassian Jira Server for Slack plugin from version 0.0.3 before version 2.0.15 allows remote attackers to execute arbitrary code via a template injection vulnerability.
How severe is CVE-2021-26068?: CVE-2021-26068 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26068 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26068?: CVE-2021-26068 affects Atlassian Jira Server For Slack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26068?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26068 published?: CVE-2021-26068 was published on 2021-02-22 and last updated on 2026-06-17.

References

https://confluence.atlassian.com/jira/jira-server-for-slack-security-advisory-17th-february-2021-1044091690.html

Affected products (1)

cpe:2.3:a:atlassian:jira_server_for_slack:*:*:*:*:*:*:*:*

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