CVE-2026-61847

Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when the ":preservecomments" option is not enabled, which is the default, Crass discards CSS comments by recursively consuming the next token. An attacker-provided stylesheet containing a...

GHSA-WWPR-JFF3-395C Crass: A large number of adjacent CSS comments can trigger a SystemStackError

Impact When the :preservecomments option is not enabled which is the default behavior, Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a...

Crass: A large number of adjacent CSS comments can trigger a SystemStackError

Impact When the :preservecomments option is not enabled which is the default behavior, Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a...

PT-2026-133260

Name of the Vulnerable Software and Affected Versions Crass versions prior to 1.0.7 Description When the :preserve comments option is disabled the default setting, the parser discards CSS comments by recursively consuming the next token. A stylesheet containing a large number of adjacent comments...

PT-2026-133254

Impact When the :preserve comments option is not enabled which is the default behavior, Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a...

CVE-2026-50290

SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped "expression" and "urljavascript:" using simple regex, but could be bypassed with CSS unicode escapes "\65xpression", null bytes, or CSS comments "exp//ression". These CSS...

CVE-2026-50290 @asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped expression and urljavascript: using simple regex, but could be bypassed with CSS unicode escapes \65xpression, null bytes, or CSS comments exp//ression. These CSS injection...

CVE-2026-50290: Improper Neutralization of Input During Web Page Generation

SpecifyJS is a declarative TypeScript user interface framework. Prior to version 0.2.136, CSS value sanitization stripped expression and urljavascript: using simple regex, but could be bypassed with CSS unicode escapes \65xpression, null bytes, or CSS comments exp//ression. These CSS injection...

CVE-2026-45623 PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the...

CVE-2026-45623

PostCSS vulnerability CVE-2026-45623 affects versions up to 8.5.11. The PreviousMap parses the /*# sourceMappingURL=PATH */ comment from CSS, dereferencing PATH against the local filesystem without scheme, allowlist, or traversal checks. An attacker-controlled CSS input can cause the host process...

CVE-2026-45623 PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the...

CVE-2026-45623 PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the...

NPM: PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

NPM: PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments vulnerability discovered by ? in WordPress Npm postcss versions = 8.5.11...

PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

Summary PostCSS's PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file...

Cross-site Scripting (XSS)

Overview @asymmetric-effort/specifyjs is an A declarative TypeScript UI framework built for performance and simplicity Affected versions of this package are vulnerable to Cross-site Scripting XSS in the renderToString process. An attacker can inject malicious CSS expressions by bypassing the...

GHSA-93Q6-WWJH-JC6H @asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

Finding Location: core/src/server/render-to-string.ts:307-311 CSS value sanitization stripped expression and urljavascript: using simple regex, but could be bypassed with CSS unicode escapes \65xpression, null bytes, or CSS comments exp//ression. Mitigating Factor: These CSS injection vectors onl...

@asymmetric-effort/specifyjs: CSS expression sanitization is bypassable in renderToString

Finding Location: core/src/server/render-to-string.ts:307-311 CSS value sanitization stripped expression and urljavascript: using simple regex, but could be bypassed with CSS unicode escapes \65xpression, null bytes, or CSS comments exp//ression. Mitigating Factor: These CSS injection vectors onl...

PT-2026-55466

Name of the Vulnerable Software and Affected Versions SpecifyJS versions prior to 0.2.136 Description CSS value sanitization in the core/src/server/render-to-string.ts file used simple regular expressions to strip expression and urljavascript:, which could be bypassed using null bytes, CSS...

PT-2026-55383

Finding Location: core/src/server/render-to-string.ts:307-311 CSS value sanitization stripped expression and urljavascript: using simple regex, but could be bypassed with CSS unicode escapes 65xpression, null bytes, or CSS comments exp//ression. Mitigating Factor: These CSS injection vectors only...

A large number of adjacent CSS comments can trigger a SystemStackError

Impact When the :preservecomments option is not enabled which is the default behavior, Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a...