How severe is CVE-2019-5431?

CVE-2019-5431 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-5431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5431?

CVE-2019-5431 affects Twitter Twitter Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5431?

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

When was CVE-2019-5431 published?

CVE-2019-5431 was published on 2019-05-06 and last updated on 2026-06-17.

CVE-2019-5431

CVE-2019-5431 is a medium-severity vulnerability in Twitter Twitter Kit with a CVSS 3.x base score of 5.4. 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-345.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.5
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Twitter Twitter Kit
Published: 2019-05-06
Last modified: 2026-06-17

Description

This vulnerability was caused by an incomplete fix to CVE-2017-0911. Twitter Kit for iOS versions 3.0 to 3.4.0 is vulnerable to a callback verification flaw in the "Login with Twitter" component allowing an attacker to provide alternate credentials. In the final step of "Login with Twitter" authentication information is passed back to the application using the registered custom URL scheme (typically twitterkit-<consumer-key>) on iOS. Because the callback handler did not verify the authenticity of the response, this step is vulnerable to forgery, potentially allowing attacker to associate a Twitter account with a third-party service.

Frequently asked questions

What is CVE-2019-5431?: This vulnerability was caused by an incomplete fix to CVE-2017-0911. Twitter Kit for iOS versions 3.0 to 3.4.0 is vulnerable to a callback verification flaw in the "Login with Twitter" component allowing an attacker to provide alternate credentials. In the final step of "Login with Twitter" authentication information is passed back to the application using the registered custom URL scheme (typically twitterkit-<consumer-key>) on iOS. Because the callback handler did not verify the authenticity of the response, this step is vulnerable to forgery, potentially allowing attacker to associate a Twitter account with a third-party service.
How severe is CVE-2019-5431?: CVE-2019-5431 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-5431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5431?: CVE-2019-5431 affects Twitter Twitter Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5431 published?: CVE-2019-5431 was published on 2019-05-06 and last updated on 2026-06-17.

References

https://blog.twitter.com/developer/en_us/topics/tips/2018/vulnerability-in-twitter-kit-for-ios.html

Affected products (1)

cpe:2.3:a:twitter:twitter_kit:*:*:*:*:*:iphone_os:*:*

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CVE-2019-16263 — High (CVSS 7.4): The Twitter Kit framework through 3.4.2 for iOS does not properly validate the api.twitter.com SSL certificate.…
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