CVE-2019-20105

CVE-2019-20105 is a medium-severity vulnerability in Atlassian Application Links with a CVSS 3.x base score of 4.9. 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-306.

Key facts

• Severity: Medium (CVSS 3.x base score 4.9)
• CVSS v2: 4.0
• EPSS exploit prediction: 1% (73rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-306
• Affected product: Atlassian Application Links
• Published: 2020-03-17
• Last modified: 2026-06-17

Description

The EditApplinkServlet resource in the Atlassian Application Links plugin before version 5.4.20, from version 6.0.0 before version 6.0.12, from version 6.1.0 before version 6.1.2, from version 7.0.0 before version 7.0.1, and from version 7.1.0 before version 7.1.3 allows remote attackers who have obtained access to administrator's session to access the EditApplinkServlet resource without needing to re-authenticate to pass "WebSudo" in products that support "WebSudo" through an improper access control vulnerability.

Frequently asked questions

What is CVE-2019-20105?

The EditApplinkServlet resource in the Atlassian Application Links plugin before version 5.4.20, from version 6.0.0 before version 6.0.12, from version 6.1.0 before version 6.1.2, from version 7.0.0 before version 7.0.1, and from version 7.1.0 before version 7.1.3 allows remote attackers who have obtained access to administrator's session to access the EditApplinkServlet resource without needing to re-authenticate to pass "WebSudo" in products that support "WebSudo" through an improper access control vulnerability.

How severe is CVE-2019-20105?

CVE-2019-20105 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2019-20105 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20105?

CVE-2019-20105 primarily affects Atlassian Application Links. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-20105?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-20105 published?

CVE-2019-20105 was published on 2020-03-17 and last updated on 2026-06-17.

References

• https://ecosystem.atlassian.net/browse/APL-1391
• https://jira.atlassian.com/browse/JRASERVER-70526

Affected products (2)

• cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:application_links:7.0.0:*:*:*:*:*:*:*

More vulnerabilities in Atlassian Application Links

• CVE-2017-18111 — High (CVSS 8.7): The OAuthHelper in Atlassian Application Links before version 5.0.10, from version 5.1.0 before version 5.1.3, and from…
• CVE-2017-18096 — High (CVSS 7.2): The OAuth status rest resource in Atlassian Application Links before version 5.2.7, from 5.3.0 before 5.3.4 and from…
• CVE-2017-16860 — Medium (CVSS 6.1): The invalidRedirectUrl template in Atlassian Application Links before version 5.2.7, from version 5.3.0 before version…
• CVE-2018-20239 — Medium (CVSS 5.4): Application Links before version 5.0.11, from version 5.1.0 before 5.2.10, from version 5.3.0 before 5.3.6, from…
• CVE-2018-5227 — Medium (CVSS 4.8): Various administrative application link resources in Atlassian Application Links before version 5.4.4 allow remote…
• CVE-2019-15011 — Medium (CVSS 4.3): The ListEntityLinksServlet resource in Application Links before version 5.0.12, from version 5.1.0 before version…

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