Bug 2496907 (CVE-2026-14620)

Summary:	CVE-2026-14620 webpack-dev-server: webpack-dev-server: Arbitrary file opening and denial of service via exposed developer endpoints
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aazores, abarbaro, abrianik, alizardo, anpicker, ataylor, bbrownin, bdettelb, bparees, brasmith, cdrage, cmah, cochase, dbruscin, dkeler, doconnor, dranck, dschmidt, dymurray, eaguilar, ebaron, ehugonne, fmariani, ggrzybek, gmalinko, gparvin, hasun, ibolton, janstey, jchui, jfula, jhe, jkoehler, jlanda, jmatthew, jmontleo, jolong, jowilson, jraez, jwong, jwon, kaycoth, kshier, ktsao, kvanderr, lchilton, lphiri, mcarlett, nboldt, nyancey, oaljalju, omaciel, ometelka, parichar, pgaikwad, pjindal, psrna, ptisnovs, rhaigner, rhel-process-autobot, rjohnson, rstepani, rushinde, sfeifer, simaishi, slucidi, sseago, stcannon, suppawar, syedriko, tasato, tcunning, teagle, thason, ttakamiy, watson-tool-maintainers, xdharmai, yfang, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in webpack-dev-server. This vulnerability allows a remote attacker to exploit exposed internal developer endpoints, `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate`, through cross-origin requests. By visiting a malicious website while the development server is active, an attacker can open arbitrary local files in the developer's editor, including those outside the project directory. Repeated exploitation can lead to a denial of service by spawning numerous editor processes and forcing recompilations, degrading the developer's system performance.	Story Points:	---
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2497248, 2497252, 2497253, 2497254, 2497249, 2497250, 2497251, 2497255
Bug Blocks:

Description OSIDB Bzimport 2026-07-03 18:01:27 UTC

webpack-dev-server versions 5.2.5 and earlier expose two internal developer endpoints, /webpack-dev-server/open-editor and /webpack-dev-server/invalidate, that perform state-changing actions on any GET request without verifying that the request originated from the dev server's own page. Any website a developer visits while the dev server is running can trigger these endpoints cross-origin with no interaction beyond the visit. An attacker can open an arbitrary existing local file in the developer's editor, including files outside the project root, and repeated requests can spawn editor processes and force recompilations that degrade the developer's machine. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: none.