Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
4 results
Mar 17, 2026A vulnerability was determined in Duende IdentityServer4 up to 4.1.2.CVE-2026-4349 · Other software · Duende · reported by VulDBMedium 6.3
A vulnerability was determined in Duende IdentityServer4 up to 4.1.2. The affected element is an unknown function of the file /connect/authorize of the component Token Renewal Endpoint. This manipulation of the argument id_token_hint causes improper authentication. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. This vulnerability only affects products that are no longer supported by the maintainer.
- Product
- IdentityServer4
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 11, 2022A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value passed to the data-secret-value parameter.CVE-2021-28290 · Other software · Identityserver4.admin Project · reported by MITREMedium 6.1
A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value passed to the data-secret-value parameter.
- Product
- Identityserver4.admin
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 21, 2019IdentityServer IdentityServer4 through 2.4 has stored XSS via the httpContext to the host/Extensions/RequestLoggerMiddleware.cs LogForErrorContext method, whichCVE-2019-12250 · Other software · Identityserver · reported by MITREMedium 6.1
IdentityServer IdentityServer4 through 2.4 has stored XSS via the httpContext to the host/Extensions/RequestLoggerMiddleware.cs LogForErrorContext method, which can be triggered by viewing a log. NOTE: the software maintainer disputes that this is a vulnerability because the request logger is not part of IdentityServer but only our development test host
- Product
- Identityserver4
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Mar 22, 2018IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSCVE-2018-8899 · Other software · Identityserver · reported by MITREMedium 6.1
IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSS in some configurations.
- Product
- Identityserver4
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
Weekly security brief
The flaws that hit local websites, every Friday.
One short email: what got exploited this week, which WordPress plugins broke, and what to check. Unsubscribe in one click.
Tell us what you're building.
A website, your marketing, a security check, an app, or the thing you've been running out of a spreadsheet for three years. A few lines is plenty.
Not ready to talk yet? Run the free website check and see what Google sees.