Bug 2507836 (CVE-2026-53667)

Summary: CVE-2026-53667 react-router: React Router: Untrusted redirects due to missing protocol validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aazores, abarbaro, abokovoy, abrianik, alizardo, amctagga, anjoseph, anpicker, anthomas, anujha, aoconnor, aruklets, aschwart, asoldano, aszczucz, ataylor, bbaranow, bmaxwell, bniver, boliveir, brasmith, bstansbe, cdrage, cmah, cmyers, cochase, dbosanac, dbruscin, dkeler, dlofthou, dnakabaa, doconnor, dranck, drichtar, dschmidt, dymurray, eaguilar, ebaron, eborisov, ehelms, ehugonne, ewittman, flucifre, fmariani, frenaud, ftrivino, ggainey, ggrzybek, gmalinko, gmeno, gparvin, groman, hasun, ibolton, istudens, ivassile, iweiss, janstey, jchui, jfula, jhe, jlanda, jmatsuok, jmatthew, jmontleo, jowilson, jpasqual, jprabhak, jraez, jreimann, jtolenti, juwatts, jwon, kaycoth, kbempah, kshier, ktsao, kvanderr, lball, lchilton, lcouzens, mbenjamin, mcarlett, mdellweg, mdessi, mhackett, mhulan, mosmerov, mposolda, mrizzi, msvehla, mwringe, nboldt, ngough, nipatil, nmoumoul, nwallace, nyancey, oaljalju, ometelka, osousa, pantinor, parichar, pberan, pcattana, pcreech, pesilva, pgaikwad, pjindal, pmackay, prwatson, psrna, ptisnovs, rchan, rhaigner, rhel-process-autobot, rjohnson, rkubis, rmartinc, rstancel, rstepani, rushinde, sdawley, sfeifer, simaishi, slucidi, smallamp, solenoci, sostapov, sseago, ssilvert, stcannon, sthorger, suppawar, syedriko, tasato, tcunning, teagle, thason, thjenkin, tmalecek, vdosoudi, vereddy, veshanka, vmuzikar, watson-tool-maintainers, wtam, xdharmai, yfang, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in React Router. The RSCErrorHandler component, used in applications leveraging unstable React Server Components (RSC) Application Programming Interfaces (APIs), is missing crucial protocol validation. This vulnerability allows an attacker to redirect users to untrusted external websites. Such redirects can lead to information disclosure or facilitate phishing attacks, potentially exposing sensitive user data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-27 22:01:37 UTC
React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.